4-hydroxy-2-quinolones. 204.* synthesis, bromination, and analgetic properties of 1-allyl-4-hydroxy- 6,7-dimethoxy-2-oxo-1,2-dihydroquinoline-3-carboxylic acid arylalkylamides
作者:I. V. Ukrainets、E. V. Mospanova、N. A. Jaradat、O. V. Bevz、A. V. Turov
DOI:10.1007/s10593-012-1143-7
日期:2012.12
obtained are halogenated with cyclization by one equivalent of molecular bromine to give the corresponding 2-bromomethyl-7,8-dimethoxy-5-oxo-1,2-dihydro-5H-oxazolo[3,2-a]quinoline-4-carbox-amides. However, the reaction proceeds quite differently when using an excess of bromine. After the usual initial oxazole ring closure, the excess bromine brominates the aromatic ring of the amide fragment. The results of